/**
    * Copyright 2005-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.kuali.rice.kns.web.servlet.dwr;
  
  import org.directwebremoting.spring.SpringCreator;
  import org.kuali.rice.core.api.config.property.ConfigContext;
  import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
  import org.kuali.rice.kew.api.doctype.DocumentTypeService;
  import org.springframework.beans.factory.BeanFactory;
  
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.Method;
  import java.lang.reflect.Proxy;
  
  /**
   * A {@link SpringCreator} that checks the {@link GlobalResourceLoader} for the
   * bean name in question if the default {@link BeanFactory} (the applications)
   * does not have the bean in question.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   * 
   */
  public class GlobalResourceDelegatingSpringCreator extends SpringCreator {
  
      public static final String KEW_RUN_MODE_PROPERTY = "kew.mode";
      public static final String DOCUMENT_TYPE_SERVICE = "enDocumentTypeService";
  
  	@Override
  	public Object getInstance() throws InstantiationException {
  
          //KULRICE-7770 enDocumentTypeService isn't supported in remote mode
          if(ConfigContext.getCurrentContextConfig().getProperty(KEW_RUN_MODE_PROPERTY).equals("REMOTE") &&
                  this.getBeanName().equals(DOCUMENT_TYPE_SERVICE))
          {   
              return Proxy.newProxyInstance(getClass().getClassLoader(), new Class<?>[]{DocumentTypeService.class},
                  // trivial invocationHandler
                  new InvocationHandler() {
                      @Override
                      public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                          return null;
                      }
                  }
              );
          }
  
          Object bean = GlobalResourceLoader.getService(this.getBeanName());
      
          if (bean == null) {
              throw new InstantiationException("Unable to find bean " + this.getBeanName() + " in Rice Global Resource Loader");
          }
  
          return bean;
  	}
  
  }